Options:
- A. 5000 nm
- B. 5000A
- C. 500m
- D. 2000um
View Answer
B. 5000A
Physics
appearance of colour in thin films is due to ____________________?
Options:
- A. diffraction
- B. dispersion
- C. interference
- D. polarization
View Answer
C. interference
Electrical energy is measured in___________________?
Options:
- A. watt
- B. horse power
- C. kilo watt
- D. kilowatt hour
View Answer
D. kilowatt hour
Wavelength of X-rays falling at glancing angle of 30? on a crystal with atmic spacing 2 x 10-10 for the fist order diffraction is________________?
Options:
- A. 4 x 10-10 m
- B. 2 x 10-10 m
- C. 0.02
- D. 20
View Answer
B. 2 x 10-10 m
Electrical energy is converted to heat at the rate of___________________?
Options:
- A. IRt
- B. I2R
- C. I2Rt
- D. VIt
View Answer
B. I2R
In a plane polarized light _________________?
Options:
- A. vibration in all direction
- B. vibration in two mutually perpendicular directions
- C. vibration take place in a direction perpendicular to the direction of propagation of light
- D. no vibration at all
View Answer
C. vibration take place in a direction perpendicular to the direction of propagation of light
A fuse is placed in series with the circuit to protect against__________________?
Options:
- A. high power
- B. high voltage
- C. high current
- D. over heating
View Answer
D. over heating
Which one of the following cannot be polarized ?
Options:
- A. radio waves
- B. ultraviolot rays
- C. X-rays
- D. sound waves
View Answer
D. sound waves
A wire having very high value of conductance is said to be____________________?
Options:
- A. very good conductor
- B. moderately good conductor
- C. an insulator
- D. no specific criterion available
View Answer
A. very good conductor
A wire of uniform area of cross-section A length L and resistance R is cut into two parts. Resistivity of each part _________________?
Options:
- A. remains the same
- B. is doubled
- C. is halved
- D. becomes zero
View Answer
A. remains the same